Cup storage rack



FIG. 1 is a front perspective view of a cup storage rack, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 shows its expanded state diagram.

The broken lines in the drawings illustrate the portions of the cup storage rack, which form no part of the claimed design. 

CLAIM The ornamental design for a cup storage rack, as shown and described. 